Question

The solubility of alkali metal hydroxide is:
A)$LiOH < KOH < NaOH < RbOH < CsOH$
B)$LiOH < NaOH < KOH < RbOH < CsOH$
C)$CsOH < RbOH < KOH < NaOH < LiOH$
D)None of the above

Answer 1

The alkali metals are a collection of chemical elements on the periodic table's s-block that have similar properties: they are silvery and can be cut with a plastic knife. At standard temperature and pressure, alkali metals rapidly shed their outermost electrons, forming cations with charge plus one.

Complete answer: Alkali metal hydroxide - Alkali hydroxides are a type of chemical compound that has an alkali metal cation and a hydroxide anion. The following are alkali hydroxides: Lithium hydroxide, Sodium hydroxide, Potassium hydroxide, Rubidium hydroxide, and Cesium hydroxide are all examples of electrolytes.
Trends for solubility of alkali earth metal –
1)The cationic radius will influence the lattice enthalpy in alkaline earth metal hydroxides, where the anion is prevalent. With increasing ionic size, the lattice enthalpy reduces considerably more than the hydration enthalpy, solubility increases down the group.
2)Due to the fact that anions are substantially larger than cations, the lattice enthalpy will be nearly constant throughout a group. Solubility diminishes as the hydration enthalpy lowers down the group, as shown in alkaline earth metal carbonates and sulphates.
So, by following this result we conclude that solubility of alkali metal hydroxides increases down the group.
So, the final answer is option (A) i.e., $LiOH < KOH < NaOH < RbOH < CsOH$ .

Note:
Periodic trends are distinct patterns in the properties of chemical elements that can be found in the periodic table. Electronegativity, ionization energy, electron affinity, atomic radii, ionic radius, metallic character, and chemical reactivity are all major periodic patterns.